It looks like "This task is not available anymore"

If system has exhibited the message "This task is not available anymore", you are in one of both situations below:

a. - You are seeing your task list and can see the task A;- Another authorized user deletes task A;- You click on task A, but receive the message above. The task A disappears from your task list.

OR

b. - You are seeing your task list and can see the task A;- Another user removes your team permission to see task A;- You click on task A, but receive the message above. The task A disappears from your task list.